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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed906785876861803b3837912ef1c694f30c5bda268a7b66d64ec90e84a15ea7' 
  AND token = '1y/92YxwWDtwOQW67GYoTSC8qIzktCTxqRgz/EMch7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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