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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508df73eeb5974f6e014340ef77767cc7ce22bc48e067993a6d5cdbe25fe3c5f' 
  AND token = 'kc5Unn98UAFFCCJ0cRqvq05XvENcEOnqQpxa7E2X+ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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