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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ffff1ba0fe0e5139c305219c7705a37fc7a37d03bfe052b12eabc47f7ad63b' 
  AND token = 'wrGFoPB1c0wjHPHj0fVZmoFQil6PgNKOIX609xfKz2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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