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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35076d0d09845411f73827e9ed92773aa98eea5cc714bed8c41ce3cb4b3cff6c' 
  AND token = 'KYKrshQX4hdRRsrVBRRwZV0llzl6CfCfYZO3uT1iCuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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