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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2fbf890d83ffef65fa95252530212a45b7da1a803b81ac0afbafca0b739e1e' 
  AND token = 'JddatkSY1vCz9fuxw0w9Al+CXiTrSPemLHcpr1L+iJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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