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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941e8bae09a1f7d581c80d49f7a1eb25ffaa149e0a7da79326d17fefcd6ffea8' 
  AND token = 'gxirXbCHS3hReOuXMhutiZWaaQb6Fgw4rEN63Kv1GEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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