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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d38916436017cb74bbeeb917ff4554dddd281ade063a811d535d4f45e70227' 
  AND token = 'J1R13Nqzujcq8yRi11/Icawx7uSDns+N6/mnEcxkmbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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