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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '644ce95fc0e2525ae7cb58ff798f37c9b0af5915ddd7c73e6b93984f3baad2f3' 
  AND token = 'OcgtAFNWkLIJ1mAdfYRkG71JExer3FqC6gSGxUUC1R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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