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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d04a8789b196d8e50ac03dfb15cf93297df38249428308002a3d0480c70fdd' 
  AND token = 'vgmL5+JTJbXFIX+t/D6R8ns6npV4kaZKAkeiZpWbhLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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