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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d1e0778d1c162a81f23244c8d5046ea552b9fff601d80b8eca7aa2922f1f2a' 
  AND token = 'o00v7GdYpoeIPIxreDglbNtvzPQldP1PjT94Jrmm5fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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