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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6404603c28481d67ed8255de422771cdbc4245da81eb09cb5ca8d7e44afab759' 
  AND token = 'QaO4mj+4h0xacwLeNunEjSPePHFZXZj0zw5fYV0kRV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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