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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c0fe8f3413f3a56c96b4184a90755507e84d3f7c5875ce67ea0f9080aa9f267' 
  AND token = 'KEE6aqs247/6GSQY3LefL45lpJXNg+FPheswyV1nq5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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