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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe528df98a8691e6dbfcd267cb470e0a135b51c5c9728303ed372d62e36b3c2f' 
  AND token = 'ah+c0s0mS2e3TLNndn+0NxetcUvvc9zvWUDvLbQP/6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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