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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d3ed8fe417eecf78dfa930fa18a51542fa9a0126e893a24285c0f4ff1e34a4' 
  AND token = '55k3aEUPqW2FavNa66epblFpfUeaKU49hylFoc2TVwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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