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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b4b439c72cc6af79aadba2290fa7deac0e831fa9d9751893309beb5b63ea19' 
  AND token = 'wLREFUQ8aHO1pn47wJFraNTzzsiG1cntCI5QXCrEndE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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