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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85e9f50ae532ef6924c55a51dc7cb4240debd6f9b0f20cbbbf1cc818b36e000' 
  AND token = 'AC7cvx0xboGMx8/WxBXsi0uJWpi/aetxk/pR2iP/oVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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