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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20280529eb107ec05a1172fa7fd35f11ec341c039788efa482401f120146fae9' 
  AND token = 'Sk9S+RaFQqKxmPO0AE/FAOZxa40FEogEKrUeoc8Kn0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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