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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddaf2996d00c7822448f3843fb542e5f967b8807aaa64b5713c8d0682224938c' 
  AND token = 'ASsFsUToJEP85aLe/sa+1BOpXc8elQv0kjBMspJWcaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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