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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4e3a759d44897c1d85eb568b44307c4b78ac6be4772331b639752bfb3465c7' 
  AND token = '6WqWWJ3PpDr+KzszdWCbx5uaAvoRRbARmumyF3Snphk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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