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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f91a54fa6b9bc0793840c07eec74ce77b8176a7afda1ad4909fd7fee29ccbb' 
  AND token = 'k+x6BJJymaQgpQlwj9/ZT1tPKcpOSCmIsW2QKRFPEG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}