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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ecb18ae94e911c14ca57c15a2b5b63bc290bb65437951b496809d2141ec0aa' 
  AND token = '3cuVro2iUPPqa6SaVve9O/rLlusQtu2BDC7x93tteeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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