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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a790c4ea4e41abf78086aeee0885c1b419f908c1f58eb782f0a40f5d0e5c753d' 
  AND token = 'QtvwTr7Z6mpGT3tEpQJBGckprx8Ulc3Z4VwRpjZrEOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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