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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed18c06d24e5d7cbdce751be520c3c7409dd264469c3dbbc43433b076085dee' 
  AND token = 'g3Ou+ZkUEHQrwoPMAL4u36dvnJfkDxl0R+qQvfuujXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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