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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3022e4cc4a2b7a8ba9d476924dc14a30a4fd676bdf90b10b946b44d52117aab' 
  AND token = 'P6FrWPZOEpbkBScHNazRvd4YCRp69HYpLkh3zY0Da5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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