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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173e873493ba1a63b1645ec61e5f5584a3ee6db33540ca41c0f9ee533c80e75d' 
  AND token = 'LdHPQcAdjd8AH17K6NJ7p241PHrdJT+zzme8XtELRks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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