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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85f00ba0c483b19f1c2b201069cc6516db65aa4c2bc51913e71944ae37a545e' 
  AND token = 'j02v4WVYVt9DoayByMUXgfx1kHJYLbPCQ6jiLpxI9yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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