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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da15e6f3fed3b2d823d32b28481ee8815be04e50a47d2b04197ea109c9c4110a' 
  AND token = 'gics7MnIWV32f+PjzVV7Tw12HcGgWytZjSC065bZChc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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