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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9054b05b9c6df703e5ff96a5c299d5002cca71a24111974d40c9322855b000' 
  AND token = 'alBLqcS9rwYR0fqT9TeRoLX2XLGPoAH29f6hMPU+F60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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