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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3a60ec26540d2657b4c205dc4c713d109270e3f3913bbf49ff7b75336ab139' 
  AND token = 'D6R6DZuYqIreyq5YyqYSoBXG0HsCDusQXAm5H9E0fj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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