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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f2b1ec9e2fb048cd3eb301d334ab07f5f014d3b1bda0dd8a04588fe795b31b' 
  AND token = '+pouR94J+PnVtULD5Ab82aNHOkhfhndIVxP5n4tzUvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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