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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0996144c30cff3ae0405867a2d1b77d8a807096b56c9a79469838d5b4772ebb5' 
  AND token = 'i7+D6XxWhnNAVU5fRTt2dRq4SFzqYKaFGFE54l592ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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