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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79727c41662bab15d1c364c72f489977e088415534586ea7c1310ee22aa62cf' 
  AND token = '5K70lFrWQwrk1CmM6hDs79yBEctauCqnl/xDNoyv2y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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