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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70990eb826e66751604114e066a229bbf60e6b0786303f7892f4ccb21906fdb' 
  AND token = 'gwuyzjkAJ1DHNXZVoAL638xqVYO6UwTofFJ6IyXfMrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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