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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0788fae2fb739c557a01d49d07756125c6a3501153e7f4a8442bac15da7904b0' 
  AND token = 'h2yjTdjIN0CXgoTqIWHitMKnx7PBKGxxXjzungWDa5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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