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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23213bc2ff1dea5009fa39813b85b0c3d131b6cf587910ad1f40d3c1fb0e5d3' 
  AND token = 'muQEOkf4eVp8i6bMrdBJP6wPHzMo6pXffZOMS2AueFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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