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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0055c3a8fcc2205aaab1683fe54b373835fb827d20a00ee85fb47ab0f9126faf' 
  AND token = 'TiOjLfuk5nLrEy5/rwOm4hj2rJ0808sKEw92w033HHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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