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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feda10584dacb16ed1dd90a22bb9ad3a7de0a75fd28d338e2414095badc5129d' 
  AND token = 'cuzouzVzpGNqbXxec8hwDPI5OLiROL2fWJMYrQu2vxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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