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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e36d6fae8bcab458462f74da85f47a2e77ab1cc6ab511d6c845802d06012af' 
  AND token = '5gk/VsqZB6Y+iT1S70DaRN1dFCoxX+IE82nxqTIU0Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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