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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b705a104be364f812ecf46574d9150446af24e04445860b7bc0da0ae0552c73e' 
  AND token = 'PWBfJRHB0lrNyG9Jc9WyukUUctZWNKaL683GMGwoKBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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