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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284a68e385e90cac33dd8c8d68f9f358497c600d975ad673198e443501a8ead8' 
  AND token = 'vy/dYyDOm0QZQ8Jp6QCXBvYyRg2s+I+Fvr+LtHgZJyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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