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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31602cb849714f1073d87db7bfc73a10d69140a3e8abae2c2a8c2cf2303e13aa' 
  AND token = 'AjGPvhhwwEJ0LrIIyAUKKpMfvtSOmbnGbXAPoEBi0jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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