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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '120c0d0b3a482b42149cc752efe8b003da2ab9ad2e9540f3ac3ed6f321ed82a9' 
  AND token = 'Z7m94ZFfKlJTRHImJg19YbakUZRgoF5oGUsvsEmsXLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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