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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1c4d4734364dac740aca8aedd48a14a5a27373f8d029c9f74df4ea1ec6e4c8' 
  AND token = '1C+ubb5WaC/qjm5H3iO/w3triesYUffTrVZSbw0ZHvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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