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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d3f40b0a4dfc5763470f2fb8a1ec69b2672d5fe7cdf57389ef96a38e70c7aa' 
  AND token = 'ss3UdqIOlrFfDE8fr4o+jv5X7z9ROemIWwVd9tx01g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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