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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec0f498b9cd826a61d5e2f124d0dacfd0852536b077dc409aed8983c175ded1' 
  AND token = 'MScsQJtcJfw36ys2tGFaoV8Ead1TV3ZFD+F7WWxQ3fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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