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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60fd5bead3a0e21e95d90b0b8904e2ad9ef728964bca0ffe45b5fd7fa44c617b' 
  AND token = 'CdNtfBx+fWBL9jPMgI5uNQMmv2EHddwWpRWSfQzULnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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