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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d209c8bde4f1024a8460367214ac212690cedb662290ea31321d8d31e0d700' 
  AND token = 'Nv1X08b7mrIa6vmHEES+31mzbMYdnB9etNG9FyFj5IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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