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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc3796d71227b631251b72f954ccdea43215975ed41a6126c1d396abccda1f0' 
  AND token = '/TNK25hKU+7ubSGM4s7wLYU1/QEGQ1bK7OGnAlOhCTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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