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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0bf5b086a4ce70342434a1c59cc4af98bc97ec137a6613156e2fd136567e376' 
  AND token = 'sU1jTTEBqBS4lsF/o/H+TarBkZrrnuaGY5/mYkxFfds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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