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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98338873b48572ff9be546ec0751b7831465a966e4f44e756c44ea56ef76575b' 
  AND token = 'TIW9IFb3EnFuJQOkeM6eKOs69zgRr0OXCxYAk1sK0i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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