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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0dee242b889ab38f971c2080c4305e89188e3447624b9adddd781b6a7bcd28' 
  AND token = 'Tnb+lLoFWRHeM+sPgLUO3szXVJ+rCwEXSThK4Ake4GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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