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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3499772f2ce4056e68b6839ceeb2d5abfcae661e3f0f6e7c64b63f4e9528e3' 
  AND token = '6T8gsJyxGBsO98yzDhLV2MK4W1dGlw2GoAKr9+3vj5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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