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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0354a67817ee976fa40b284a4ea80ef8061eb79a95bda79ea63e27a1a0200c3' 
  AND token = 'rEzs7CAokDS7++0nlFX3EoeiRFNWDxkcadMINf0eQ9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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