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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7350cca3b90c87a667c81d7f70f68ed8b92d99def6a80e6e49cf313552bf2e' 
  AND token = 'miO1WDPmR4awn+58/MJ6sA4mLhVR5SOy3ytPlnV9Hp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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