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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae085a204d6eb5f95ec0d3b601b08879e101d46993060371a67a8ac8b9e7f82' 
  AND token = 'UCDGaFVv7Pf4njLHclGVxJP8jPCqQ49UWET1r8qnA3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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