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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546f0a552379105adbf3c827562b8f995e578973e3fa39947a9cab89cea0f72c' 
  AND token = '55F/5+Kt/st0eCKDQH2Jk5vCyQBGZIu23/QYmh0ly6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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