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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e62a104d42af80f0b29c464ca341dac27c519dd797a1cd473289d0dc7ad552' 
  AND token = 'H6A0BlvH7FsllAooq97pA7c17n7PA0bQOc6gvuGa+Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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