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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be36990a3388fb03fef8df717cf3bc6f5376b627e86510f70ce05ac4e8486a8d' 
  AND token = 'KNBio/pfFhXmnJ0dbP/F8WMuWyxEUZOJ0fRdZs32i/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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